Telegraphic transmission.



I. (SELL.

TELEGRAPHIC TRANSMISSION.

APPLICATION FILED MAR. 8, I9II. RENEWED FEB. I5, 1916.

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TELEGRAPHIC TRANSMISSION.

APPLICATION FILED MAR. 8, 1911- RENEWED FEB. 15,1916.

1,1 99,252 Patented Sept. 26, 1916.

2 SHEETS-SHEET 2.

III" I III'I III I I II III II IIIII III I III ' III III III IIII I II JOHN GELL, or LONDON, ENGLAND.

TELEGRAPHIVC TRANSMISSION.

Specification of Letters Patent.

Patented Sept. 26, 1916.

Application led March 8, 1911, Serial No. 613,080. Renewed February 15, 1916. Serial No. 78,549.

To all whom 'it may concern Be it known that I, JOHN GELL, a subject of the King of Great Britain, and resident of London, England, have invented certain new and useful Improvements in Telegraphic Transmission, of'which the following is a specification.

The Object of myinvention is to obtain a high speed of transmission over the line wire, automatic distribution, at the receiving end, to two or more receiving instruments connected to line serialz/im so the transcribing or translating from these receiving instruments may be done by different receiving. operators at a speed within the working capacity of the said respective receiving operators. This has heretofore been attempted by means of wheels at the sending and receiving stations rotating rapidly and synchronously, and with a series of segments so arranged as to momentarily place the line wire in connection successively with each of a series of transmitting and receiving instruments.

In my system the line wire is connected for a definite period of time to successive receiving instruments, which enables a continuous tape to be used for each receiving instrument, to be filed for future reference, and dispenses with the operator who at present, on high speed circuits, tears the tape into sections and manually distributes them.

Other features of my invention will be made clear in the following description and claims.

Although I do not limit myself to the use of my present invention in connection with Gell apparatus, I will, for convenience, describe it in connection therewith.

In the accompanying drawings Figures l, 2 and 3 are diagrammatic views of systems for carrying my invention into effect; Fig. 4c is a side view in the nature of a dagram of the switch at the receiving station and the electrical connections; Fig. 5 is a sectional view of Fig. 4 on the vline 5 5; Figq is a sectional view of Fig. 4L on line 6 6; Fig. 7 is a diagram of the switch disk showing its alternate switch contacts connected electrically, making a two-way switch from a disk having six contact blocks, so that by adjusting these connections the switch disk may be used with two receivers or with six receivers, or other forms of connections may be used to make a threeway switch to serve three receivers; Fig. 8 1s a view of a modified form of automatic switch at the receiving station.

In Fig. 1, 1 represents a Gell perforator which the operator is manipulating at, say, sixty words perL minute. The tape passes directly into 2, which is a Gell transmitter working also at sixty words per minute, and sending the signals onto line 3 at that rate of speed. 4 represents a reversing switch of any suitable construction, controlled by a sluggish electro-magnet 5 which, when actuated, diverts the 'line current through contactsy 6 and 7, alternately into the respective tape receiving instruments 8 and 9. Magnet 5 is so arranged that it is not actuated by moderately rapid alternating currents or by a moderately rapid succession of currents of the same polarity; but is actuated by a current of more lengthened duration or of a special character.

Let` us assume that the operator at Washington is sending a number of telegrams to New York, at too great a speed for one operator to receive them, but that he desires that the two operators in New York shall take a message in turn alternately Or as the sending Operator may determine on account of any diiferences in the lengths of the telegrams or otherwise. `When the operator has completed the first message, which is actuating receiver 8,` he will depress a special key and cause a lengthened signal or one of a specialV character to be sent to New York, which will cause the switch f-L to divert the incoming current into New Yorks receiving instrument 9,v and in like manner the third message will be diverted to receiver 8. The received slip from 8 is passed in front of the typewriter l0 worked by a typist there, and in the same manner tape from receiver 9 passes in front of typewriter 11 and is transcribed by another typist. It will'be clear from the above that if the operator works the perforator 1 at Washington at sixty words per minute, the receiving instruments 8 and 9 will work at the'same speed, but at alternate intervals, so that the two receiving typists will only have to work continuously at thirty words rper minute to keep pace with the one sending operator working continuously at sixty words per minute. The receivers 8 and 9 may be of the Gell ink recording tape character. TheY special signal sent by the transmitting operator may be done by a special signal perforated in the transmittingV tape.

Fi withgreperforators at 14 and 15 .inplaceof ink recording tape receivers such as used at 8 and 9 in F ig. 1. rThese reperforatoiscut a series of holes either corresponding to or similarly sidentical with the outgoing-tape..

at lVashington from perforator 1. This reperforated tape passes .through retransmit-vf ters 16 and 17at a speed o,-Asay,-lthi:rty= words. per minute, andthese retransmitters 16 and 17 actuatesounders- 18 and 19 from Vwhich typists 20 and 21'record.themessages` In place yofthe ink .receivers orreperfo.A rators, any other typevof apparatus*maybe-fi actuated, and in place ofthe signals roin-A retransmitters 16 and f 17 n actuatinglocal4V Sounders, the current fromathe:retransmit-'- ters 16 and 17 can be diverted to` other cities; and so avoid thecost of manualretra-nsmis other. recordingelernenngandi thence the line..

in whichthe retransmitter f16 sends thelinesfl sage, received at NewYork, Von to Boston.. I have hitherto.l referred to a two-wayswitch so placed that. a unidirection pulls will alternately divert kthe Vcurrent into two-11 diierent circuits. Itis clear that by; having a rotary arnrwith a number. oficontacts as-1 sion.. Such a system is illustratediin lIC-ign,

sociated with a 4number.sof-.circuits then-.by means of a step by :step :or other` motionfI can successively divert thedinecurrent-into a series of circuits in succession;..

messages or where required.l

I have shown .thefmain line currents work-.-.- ing the-receiving apparatus; This forni L may be used or local .circuits introducedinthe well. known manner.y Y.

It will Vloe-understood inl all cases where Iv refer `to receiving instruments thattheyfmay be ink-recording tape, 'peri'oratedfA tapeor n any other suitable form` of receiving appa-- ratus whether of tape character vor not. It s will be further understood that thefauto matic action of the switch at the receivingVV stationI is controlled from the. transmitting i station, and this .controlfmaymesult fromI sending'Y a signal over therline orfroin'the Initting station. .Y

As one `form of automaticv switch adapted to carry out myinvention, reference is made` to Figs.- 1,- vand 6, inwhich a switch-disk 23 having, say, siXcontacts 241 on its face from whichy connections leadi off to different receivers, `one .of whichV is indicated convene... tionally at 25. This disk is Vmouutedron a. fixed foot or standard7 and 1s insulated from..

2 represents the saine system but* ratchet .mechanism at 29 1n turn operated The line wire frointhe'fswitch at 23'fconnects.

,be seeni that the-switch arm .27 .will connectr with the lineiirst onereceiverl and then anaV like manner,-.,and-..infthensaine; way for-.a

i line.

froma. signal or .impulse of: special ychar-acte cessation of the sendingsign-alsat .the trans- V27,..working g;over the faceof awstandardor.

disk23 having contacts .on itsface equal in 80 Vnuinber...to thoseion. the disk-23 connectediin .,i

dividually with the motorsgofthefdifferente. receivers to ...drive the. .-mediuinewhich receivesv the recordas, :for instance, the tapei with'the mechanismof theV receiver which operates. the. .recordingwheel,l stylus .orcv

is connected vvithiearth.l :Fromthisit willVV other, according as .the Vsaid arm ,closes icone... tact .Withthe contacts on theadisk `or stanchi ard.23,fand.at the same .time the'arni27@-y will close..,the: circuit vof. local. battery 1. tofn other receiving.instruments; remaining: at rest, as well as their recordingneleinentsor members.`

VVhil'ey I; have shown a; switch v--adaptedfto connect with E, siX- receivinginstruments. in i.

successiomIhave also shown in Figj? .how this switch. may be.con'verted into a :twoflV way. or .three-.way switch by .connecting up.. thefcontacts thereof; For-a two-way switch;`

-forwinstancd I connectV segmentsor contacts 1, 3 and 5 together, and `also 2, 4 and 6, inw.V

three-way .switch Lwould connect .contacts 1 l l0 .and 4; 2 and 5; and 3 and 6.

In Fig. 8. I` show a modification of the. automatic. switch, adapted. to be .operated .byU the cessation. Aof the. .signals impressedron. the .f In this. form -the a armf27 and Contact;l supporting'v disk orstandard 23 are-.employed substantially. ,the :.-sanie .as in the fform. .irst ...i described. The pawl. and ratchet....mechasv nisin., howeverfinstead of being controlled e1.

or duration sent-.overtheevline.fromzthe transf. mitting stationis controlled :from axlocalc,

.battery .33S in.v open circuitzwithi-an `electro-1i,.- inagnetz-'anda circuit .closinglever 35,.rv

son,

.drive the motor of the receiving instrumentV .selected by the arm 27,1, the motors. of all .the a.

allow the spring 38 to close the contact at 37, thus energizing electro-magnet 34 and operating the pawl and ratchet mechanism to turn the shaft with the switch arm to connect with another receiver. The motor of this receiver is controlled from a local battery, and switch arm 27', as in the form first described. When signals are sent over the line again, the magnet 36 will be energized to break the local circuit so that the pawl lever, under the action of its spring, may set itself in position for a new action.

I have described two forms of switches to indicate that my invention, in its broad fea tures, is not limited to any particular switch mechanism, and the same is true as to the `character of the instruments used at the transmitting and receiving stations.

I claim as my invention:

l. A system of transmitting messages consisting in means for impressing the messages upon the line at a comparatively high speed, and means whereby said messages may be divided for transcribing or translation at a lower speed, consisting of a plurality of recording receiving instruments with means controlled from the transmitting station for switching out and stopping one recording receiver and switching into the line and starting another recording receiver, each taking its assignment of the message or messages while that taken by the other receiver is being translated, substantially as described.

2. A system of transmitting messages consisting in means for impressing the messages upon the line at a comparatively high speed, and means whereby said messages may be divided for transcribing or translation at a lower speed, consisting of a plurality or' recording receiving instruments with means automatically controlled from the transmitting station for switching out and stopping one recording receiver, and

switching into the line and starting anotherrecording receiver, each taking its assignment of the message or messages while that taken by the other receiver is being translated, substantially as described.

3. The herein described method of transmitting a telegraph message or messages from a transmitting to a receiving station, which consists in impressing such message or messages at the transmitting station upon a line, and during such transmission dividing them up at the receiving station by alternately switching them into a plurality of receivers whereby the message or messages may be transmitted from the transmitting station at a speed in excess of the capacity of any one receiver at the receiving station.

4. A telegraphic system having a transmitting instrument, a plurality of receivers at one receiving station, a motor for each receiver and a duplex switch at the said receiving station controlled from the trans'- mitting station to switch the line current from one receiver to another and to energize the motor of the connected receiver, substantially as described. u

5. A telegraphic system having a transmitting instrument and a plurality of receiving instruments, a motor for each receiver, a local battery for energizing the motors, and a duplex switch controlled from the transmitting station, one member of which switches the line current from one receiver to another and the other member of which connects the motor of said receiver with the local battery.

6. A telegraphic system comprising a transmitting instrument, a plurality of receivers, motors therefor, local battery connections with the motors, and a duplex switch comprising a rotary shaft having a contact arm working over a plurality of contacts to switch the line current from one receiver to another and a second arm on said shaft working over contacts to connect the motor of the selected receiver with the local battery, and electro-magnetically operated means in the line circuit for operating the said shaft, substantially as described.

In testimony whereof, I aflix my signature in presence of two witnesses.

JOHN GELL.

Vitnesses:

EDUARD N. SARTON, BENNETT S. JoNEs.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C. 

